CN105075161B - Movement station, base station and communication control method - Google Patents

Movement station, base station and communication control method Download PDF

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Publication number
CN105075161B
CN105075161B CN201380075248.8A CN201380075248A CN105075161B CN 105075161 B CN105075161 B CN 105075161B CN 201380075248 A CN201380075248 A CN 201380075248A CN 105075161 B CN105075161 B CN 105075161B
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China
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base station
space layer
movement station
station
identification information
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CN201380075248.8A
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Chinese (zh)
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CN105075161A (en
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实川大介
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富士通株式会社
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Priority to PCT/JP2013/060381 priority Critical patent/WO2014162567A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks ; Receiver end arrangements for processing baseband signals
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03343Arrangements at the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks ; Receiver end arrangements for processing baseband signals
    • H04L25/03891Spatial equalizers
    • H04L25/03961Spatial equalizers design criteria
    • H04L25/03974Spatial equalizers design criteria throughput maximization
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24Cell structures
    • H04W16/28Cell structures using beam steering
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space

Abstract

Movement station (10) carries out the radio communication based on spatial reuse between base station.Movement station (10) has CSI calculating parts (14) and sends RF portions (19).CSI calculating parts (14) select channel quality highest data unit from multiple data units, and receiving quality highest space layer is selected in the space layer for belong to the data unit.The identification information for sending the space layer that RF portions (19) select CSI calculating parts (14) is sent to above-mentioned base station as control information.

Description

Movement station, base station and communication control method

Technical field

The present invention relates to movement station, base station and communication control method.

Background technology

In the past, LTE (Long Term Evolution were being applied:Long Term Evolution) wireless communication system in, from base Stand (eNB:ENodeB) towards movement station (UE:User Equipment, user equipment) DL (Down Link:Downlink) In, use the Control on Communication order for being referred to as closed loop precoding (Closed-loop precoding).In closed loop precoding In, base station in the lump using simultaneously send the spatial reuse of multiple data flows and the data flow (Spatial to spatial reuse layer:Space layer) quantity (Transmission rank:Send order) carry out Self Adaptive Control Rank adaptation (rank adaptation), thus, directional wave beam is formed by multiple antennas.Movement station is from the defined pre-coding matrix according to each order The optimal pre-coding matrix of selection, feeds back to base station in (Precoding matrix).

Specifically, in closed loop precoding, movement station represents the CSI (Channel of channel status to base station feedback State Information:Channel condition information).Above-mentioned CSI includes the RI (Rank for representing the transmission order of recommendation Indicator:Order designator), represent recommend pre-coding matrix PMI (Precoding Matrix Indicator:Prelist Code Matrix Indicator), represent to assume that the CQI (Channel of the wireless channel quality in the case of above-mentioned RI and PMI Quality Indicator:CQI).Base station after movement station receives above-mentioned CSI, will according to above-mentioned RI and The pre-coding matrix that PMI is determined is applied to UE-specific (UE- is special) RS (Reference Signals:Reference signal) and PDSCH(Physical Downlink Shared Channel:Physical down link sharing channel), sent out to movement station Send.The movement station for receiving above-mentioned pre-coding matrix is carried out using the channel estimation value based on UE-specific RS to PDSCH Demodulation.

As described above, existing CSI feedback method is assumed to apply the sky using a movement station as the signal of destination Between multiplexing technology be SU-MIMO (Single User-Multiple Input Multiple Output:Single user-multi input Multi output) PDSCH send.Therefore, premised on ensuring reliability by retransmitting control, attention is directed to a movement for base station The transmission efficiency stood, select the pre-coding matrix of sum of ranks corresponding with the wireless channel quality order.

Prior art literature

Non-patent literature

Non-patent literature 1:IEEE 802.16Broadband Wireless Access Working Group Closed Loop MIMO Precoding(2004-11-04)、http://www.ieee802.org/16/tge/contrib/ C80216e-04_293r2.pdf

The content of the invention

The invention problem to be solved

But in recent years, develop and dynamically switch above-mentioned SU-MIMO and using multiple movement stations as the signal of destination Space multiplexing technique is MU-MIMO (Multiple User-Multiple Input Multiple Output:Multi-user-more Input multi output) technology.Also, also developing following technology:It is existing it is time-multiplexed on the basis of, also directed to sky Between multiplexing corresponding to EPDCCH (Enhanced Physical Downlink Control Channel:Enhanced physical down Link control channel) apply closed loop precoding.Therefore, in order to tackle in these technologies, it is expected extension from movement station towards base station CSI feedback method.

As the new method of CSI feedback, such as propose the feedback method of multiple CSI processes.In this method, move Dynamic Codebook subset (codebook subset) of the station with each CSI processes is limited, from the bitmap according to upper layer by CSI is fed back in the RI and PMI of limitation scope.As application examples, movement station feeds back in CSI processes 1 assume that connection cell Recommendation order SU-MIMO CSI.Also, movement station feeds back the MU- for the order 1 that assume that connection cell in CSI processes 2 MIMO and EPDCCH CSI.And then in CSI processes 3, movement station feedback assume that connection cell order 2 MU-MIMO and EPDCCH CSI.

So, in above-mentioned CSI feedback method, systematic function is improved, still, compared with the past, and movement station is sent out to base station Send the CSI (such as 12) of 2~3 times of size.Accompany with this, movement station is believed in CSI feedback to the control that base station is sent The overhead of breath is significantly increased.

Disclosed technology is to complete in view of the foregoing, its object is to, there is provided less control can be utilized Information realizes movement station from movement station to base station, base station and the communication control method of the channel status reporting from.

Means for solving the problems

In order to solve above-mentioned problem and realize purpose, in a mode, between movement station disclosed in the present application and base station Carry out the radio communication based on spatial reuse.The movement station has selector and sending part.The selector is from multiple data Channel quality highest data unit is selected in unit, and receiving quality is selected most in the space layer for belong to the data unit High space layer.The identification information for the space layer that the sending part selects the selector is sent to institute as control information State base station.

Invention effect

According to movement station disclosed in the present application mode, less control information can be utilized to realize from movement station court To the channel status reporting of base station.

Brief description of the drawings

Fig. 1 is the block diagram for the functional structure for showing movement station.

Fig. 2 is the block diagram for the functional structure for showing base station.

Fig. 3 is the block diagram for the hardware configuration for showing movement station.

Fig. 4 is the block diagram for the hardware configuration for showing base station.

Fig. 5 is the precedence diagram for illustrating the action of movement station and base station.

Fig. 6 is determined for each order for illustrating the precoding determination section of base station according to the transmission symbol of each antenna The figure of the processing of pre-coding matrix.

Fig. 7 is for illustrating the CSI calculating parts of movement station according to the processing for sending sum of ranks code word (Code word) decision LI Figure.

Fig. 8 is the figure for the digit that LI is shown according to each transmission order.

Fig. 9 is the figure of the control information for the precoding that embodiment is shown according to each CSI processes.

Figure 10 is the figure of the control information for the precoding that variation is shown according to each CSI processes.

Embodiment

Below, the embodiment of movement station disclosed in the present application, base station and communication control method is carried out in detail referring to the drawings Explanation.In addition, following examples are not defined to movement station disclosed in the present application, base station and communication control method.

First, the structure of the movement station (UE) of one embodiment disclosed in the present application is illustrated.Fig. 1 is to show to move Stand 10 functional structure block diagram.As shown in figure 1, movement station 10, which has, receives RF (Radio Frequency:Radio frequency) portion 11, FFT(Fast Fourier Transform:Fast Fourier Transform (FFT)) portion 12, channel estimation unit 13, CSI calculating parts 14, control Signal demodulation section 15, demodulated data signal portion 16, control signal generating unit 17, IFFT (Inversed Fast Fourier Transform:Inverse fast Fourier transform) portion 18, send RF portions 19.This each structure division is with being capable of unidirectional or two-way progress The mode of the input and output of signal and data is attached.

Receive conversion, quadrature demodulation and A/ of the RF portions 11 to the signal progress received from base station 20 from wireless frequency to base band D(Analog to Digital:Simulate to numeral) conversion.FFT portions 12 carry out FFT to the signal received by receiving RF portions 11 and determined When detection, CP (Cyclic Prefix) removal and FFT processing.Channel estimation unit 13 is from the reception signal after FFT processing It is UE-specific RS to extract the contrast signal that data solution is called.Also, channel estimation unit 13 is according to the UE-specific The cross-correlation of RS and known contrast signal calculates channel estimation value.

The contrast signal that CSI calculating parts 14 extract channel quality measure from the reception signal after FFT processing is CSI (channel condition information)-RS (reference signal).Also, CSI calculating parts 14 are mutual according to the CSI-RS and known contrast signal Close to calculate the wireless channel distortion i.e. channel estimation value by complex representation.And then CSI calculating parts 14 use the channel estimation value After the sum of ranks pre-coding matrix for selecting SU-MIMO, RI and PMI is determined according to their value.CSI calculating parts 14 determine The CQI of determined RI and PMI each code word is assumed, according to the CQI and reception SINR (the Signal to of each layer Interference and Noise Ratio:Signal Interference and Noise Ratio) determine LI (Layer Indicator:Level indicator). Here, code word is the unit that the coding relevant with the data sent in PDSCH ranks, and the data sent in a subframe are according to order And it is divided into maximum 2 code words.

Control signal demodulation section 15 extracts control signal from the reception signal after FFT processing, uses above-mentioned channel estimation Value carries out channel compensation.Also, control signal demodulation section 15 will apply order etc. to send by carrying out data demodulation error correction decoding Format information is restored to control information.Demodulated data signal portion 16 extracts data-signal from the reception signal after FFT processing, makes Channel compensation is carried out with above-mentioned channel estimation value.Also, demodulated data signal portion 16 according to above-mentioned transmission format information by entering Row data demodulation error correction decoding, restores to information bit.

Control signal generating unit 17 is to the CSI of the cell that is connected comprising movement station 10 (such as above-mentioned RI, PMI, CQI, LI Deng) control information carry out Error Correction of Coding and data modulation etc..IFFT Department 18 is directed to the signal sent to base station 20 and performs IFFT Processing, and additional CP.Send RF portions 19 signal of sending object is carried out D/A (numeral to simulate) conversion, orthogonal modulation and From base band towards the conversion of wireless frequency.

Then, the structure of the base station (eNB) of one embodiment disclosed in the present application is illustrated.Fig. 2 is to show base station The block diagram of 20 functional structure.As shown in Fig. 2 base station 20 has scheduling unit 21, data-signal generating unit 22, control signal generation Portion 23, precoding determination section 24, UE-specific RS generating units 25, precoding processing portion 26a, 26b, 26c.Also, base station 20 have CSI-RS generating units 27, physical channel multiplexing unit 28, IFFT Department 29, transmission RF portions 210, reception RF portions 211, FFT portions 212nd, control signal demodulation section 213.This each structure division is to be capable of the input and output of unidirectional or two-way carry out signal and data Mode be attached.

Scheduling unit 21 be directed to each movement station being connected with base station 20 frequency resource allocation and send form (such as Using order etc.) selection.Data-signal generating unit 22 carries out Error Correction of Coding to the data inputted from scheduling unit 21 and data are modulated. Control signal generating unit 23 carries out Error Correction of Coding to the control information that format information is sent comprising application order etc. and data are modulated.In advance Coding determination section 24 determines SU-MIMO pre-coding matrix according to the RI and PMI reported from movement station 10, and according to CQI The pre-coding matrix of order 1, order 2 is determined with LI.Also, precoding determination section 24 is to each precoding processing portion 26a, 26b, 26c Export the corresponding each precoding of PDSCH and EPDCCH of MIMO method (SU-MIMO or MU-MIMO) with being determined by scheduling unit 21 Matrix.UE-specific RS generating units 25 generate above-mentioned UE-specific RS.Each precoding processing portion 26a, 26b, 26c root Precoding processing is performed according to each pre-coding matrix inputted from precoding determination section 24.

CSI-RS generating units 27 generate above-mentioned CSI-RS.Physical channel multiplexing unit 28 is entered line frequency to each physical channel and answered With.IFFT Department 29 is directed to the signal sent to movement station 10 and performs IFFT processing, and additional CP.RF portions 210 are sent to sending The signal of object carries out D/A conversions, orthogonal modulation and from base band to the conversion of wireless frequency.RF portions 211 are received to from movement station 10 signals received carry out conversion, quadrature demodulation and the A/D conversions from wireless frequency to base band.FFT portions 212 are to by receiving RF portions 211 signals received carry out detection, the CP removal and FFT processing of FFT timings.Control signal demodulation section 213 is after FFT processing Reception signal in extract the DM-RS of control signal and up-link (not shown), estimated using the channel obtained by above-mentioned DM-RS Evaluation carries out channel compensation.Also, control signal demodulation section 213, will be from movement station by carrying out data demodulation error correction decoding The CSI (such as above-mentioned RI, PMI, CQI, LI etc.) of 10 reports is restored to above-mentioned control information.

Movement station 10 is realized such as the pocket terminal as portable phone or smart mobile phone.Fig. 3 shows movement station 10 The block diagram of hardware configuration.As shown in figure 3, movement station 10 has CPU (Central Processing Unit in hardware aspect:In Central processor) 10a, memory 10b, RF circuits 10c, LCD (the Liquid Crystal Display for possessing antenna A1:Liquid crystal Display) or EL (Electro Luminescence:Electroluminescent) etc. display device 10d.Memory 10b is, for example, SDRAM (Synchronous Dynamic Random Access Memory:Synchronous Dynamic Random Access Memory) etc. RAM (Random Access Memory:Random access memory), ROM (Read Only Memory:Read-only storage), flash memory.On function The corresponding relation of structure and hardware configuration, in each functional structure key element shown in Fig. 1 except receiving RF portions 11 and sending RF portions Structural element beyond 19 is realized such as the integrated circuit as CPU10a.Also, receive RF portions 11 and send RF portions 19 by RF electricity Road 10c is realized.

Fig. 4 is the block diagram for the hardware configuration for showing base station 20.As shown in figure 4, as hardware configuration key element, base station 20 has DSP(Digital Signal Processor:Digital signal processor) 20a, FPGA (Field Programmable Gate Array:Field programmable gate array) 20b, memory 20c, RF (Radio Frequency:Radio frequency) circuit 20d, network IF (Inter Face:Interface) portion 20e.DSP 20a and FPGA 20b via network IF portion 20e such as switches can carry out various letters Number and the modes of input and output of data be attached.RF circuits 20d has antenna A2, A3.Memory 20c is, for example, SDRAM Deng RAM, ROM, flash memory.On functional structure and the corresponding relation of hardware configuration, removing in each functional structure key element shown in Fig. 2 The structural element for sending RF portions 210 and receiving beyond RF portions 211 is realized such as the integrated circuit as DSP 20a, FPGA 20b. Also, send RF portions 210 and receive RF portions 211 and realized by RF circuits 20d.

Then, action is illustrated.Fig. 5 is the precedence diagram for illustrating the action of movement station 10 and base station 20.

First, after the CSI calculating parts 14 of movement station 10 receive CSI-RS from base station 20 (S1), determined using the CSI-RS SU-MIMO order, pre-coding matrix and layer (S2).

In S3, the transmission RF portions 19 of movement station 10 are sent by CSI processes #1 to base station 20 represents what is determined in S2 The RI and PMI of sum of ranks pre-coding matrix.In addition, in S3, movement station 10 can send expression in the lump and be hypothesized above-mentioned RI With the CQI of the wireless channel quality in the case of PMI.

In S4, the transmission RF portions 19 of movement station 10 are sent by CSI processes #2, #3 to base station 20 to be represented to determine in S2 Layer LI.In addition, in S4, movement station 10 can send the wireless communication in the case that expression has been hypothesized above-mentioned LI in the lump The CQI of road quality.

In S5, the precoding determination section 24 of base station 20 is determined using the above-mentioned RI and PMI received of the CSI processes #1 by S3 Determine SU-MIMO precoding, also, the above-mentioned LI received using CSI processes #2, #3 by S4 determines MU-MIMO's Precoding and EPDCCH precoding.

In S6, the prelisting according to the SU-MIMO determined in S5 by precoding determination section 24 of scheduling unit 21 of base station 20 Code and MU-MIMO precoding carry out user's scheduling.That is, scheduling unit 21 is determined with movement station 10 as in the PDSCH of destination The MIMO method (SU-MIMO) of application.

In S7, base station 20 calculates precoding processing portion 26a, 26b, 26c according to above-mentioned RI, PMI and LI EPDCCH precodings are applied to EPDCCH and its solution calls UE-specific RS, should with precoding by SU-MIMO PDSCH UE-specific RS are called for PDSCH and its solution, are transmitted by sending RF portions 210 to movement station 10.Here, it is desirable to It is noted that PDSCH solution call UE-specific RS and EPDCCH solution call UE-specific RS be utilized respectively with What different frequency resource corresponding to demodulating the physical channel of object was transmitted, different precodings can be applied respectively.

In S8, the channel estimation unit 13 of movement station 10 calls UE-specific RS progress channels to estimate according to above-mentioned solution Meter, is decoded to EPDCCH and PDSCH.

In S9, the precoding determination section 24 of base station 20 is determined using the above-mentioned RI and PMI received of the CSI processes #1 by S3 Determine SU-MIMO precoding, also, the above-mentioned LI received using CSI processes #2, #3 by S4 determines MU-MIMO's Precoding and EPDCCH precoding.

In S10, the scheduling unit 21 of base station 20 is according to the SU-MIMO determined in S9 by precoding determination section precoding Precoding with MU-MIMO carries out user's scheduling.That is, scheduling unit 21 determine with movement station 10 in the PDSCH of destination should MIMO method (MU-MIMO).

In S11, base station 20 calculates precoding processing portion 26a, 26b, 26c according to above-mentioned RI, PMI and LI EPDCCH precodings are applied to EPDCCH and its solution calls UE-specific RS, should with precoding by MU-MIMO PDSCH UE-specific RS are called for PDSCH and its solution, are transmitted by sending RF portions 210 to movement station 10.

In S12, the channel estimation unit 13 of movement station 10 calls UE-specific RS progress channels to estimate according to above-mentioned solution Meter, is decoded to EPDCCH and PDSCH.Now, movement station 10 and it is unaware that applied precoding.

Below, 6~Figure 10 of reference picture from movement station 10 to the method for the CSI feedback of base station 20 to carrying out more specifically It is bright.

Fig. 6 is the figure for being described as follows processing:The precoding determination section 24 of base station 20 determines prelisting for each order Subset of the code matrix as the pre-coding matrix for the PDSCH for applying SU-MIMO.In figure 6, M be more than 2 integer, table Show antenna number possessed by base station 20.Also, N be more than 2 integer, representation space multiplexing rank number (number of plies).J, k be N with Under integer, expression layer numbering.On wireless channel quality, layer j>Layer k.The precoding determination section 24 of base station 20 is according to movement station 10 LI selected, wireless channel is selected in each column vector of pre-coding matrix for the PDSCH for applying SU-MIMO is formed The precoding vectors (procoding vector) of the high layer of quality.The precoding vectors are applied to apply MU- MIMO PDSCH or EPDCCH transmission.

In figure 6, above-mentioned each column vector is precoding vectors corresponding with each layer being spatially multiplexed.For example, with j pairs of layer The precoding vectors answered dotted line " wj,1,wj,2,…,wj,M”.As shown in fig. 6, in the transmission for sending order 1, this Individual precoding vectors form the pre-coding matrix of order 1.On the other hand, for example, precoding vectors corresponding with layer k are to use single-point Rule " the w surroundedk,1,wk,2,…,wk,M”.As shown in fig. 6, send order 2 transmission in, the precoding vectors and with it is above-mentioned This 2 vectors of precoding vectors form the pre-coding matrix of order 2 corresponding to layer j.

Fig. 7 is the figure for determining LI processing according to sum of ranks code word is sent for illustrating the CSI calculating parts 14 of movement station 10.Such as Upper described, the unit i.e. code word ranked corresponding to the relevant coding of the data with being sent in PDSCH calculates CQI.Also, each layer Corresponding to arbitrary code word.First, the CSI calculating parts 14 of movement station 10 determine the good code word of quality according to CQI, and then, from Belong to selection in the layer of the code word and receive the good space layers of SINR.The identifier of the space layer selected, which turns into, is directed to base station The LI of 20 feedback target.As shown in fig. 7, for example, be notified of " RI=2 " as send order in the case of, CQI1≤ Selection belongs to the layer 1 of code word 1 during CQI2, in CQI1<Selection belongs to the layer 2 of code word 2 during CQI2.Also, for example, it is being notified of In the case that " RI=6 " is as order is sent, in CQI1≤CQI2, select to receive SINR most in the layer 1~3 for belonging to code word 1 High layer (such as layer 1).And then for example, be notified of " RI=8 " as send order in the case of, in CQI1<During CQI2, Belong to selection in the layer 5~8 of code word 2 and receive SINR highests layer (such as layer 5).

Fig. 8 is the figure for the digit that LI is shown according to each transmission order.As shown in figure 8, LI necessity depends on vacation If SU-MIMO recommendation order.Therefore, the control signal generating unit 17 of movement station 10 by according to feed back to the RI of base station 20 come Switch LI digit, control information can be efficiently sent.In fig. 8, it is mobile for example, in the case where sending order and being order 3,4 Stand and 1 layer is selected in 10 from 2 (=2 first powers) layers, so, LI digit is set to 1.Also, for example, sending In the case that order is order 5~8, movement station 10 selects 1 layer from 4 (=2 squares) layers, therefore LI digit is set to 2.

Fig. 9 is the figure of the control information for the precoding that embodiment is shown according to each CSI processes.As shown in figure 9, It is same in CSI processes #1, movement station 10 to base station 20 send SU-MIMO by the use of recommendation order recommendation PMI as prelisting The control information of code.On the other hand, in CSI processes #2, movement station 10 will receive the LI of the most good layers of SINR as pre- The control information of coding is sent to base station 20.Thus, the digit of the control information in CSI processes #2 is reduced from conventional 4 To 2.Equally, in CSI processes #3, movement station 10 will receive controls of the LI as precoding of the good layers of SINR second Information is sent to base station 20.Thus, the digit of the control information in CSI processes #3 is also reduced to 2 from conventional 4.Or The LI sent in CSI processes #3 to base station 20 may correspond to select in the way of the message capacity maximum for making transmission order 2 The layer gone out.That is, the precoding for generating order 2 is being selected from the corresponding pre-coding matrix of recommendation PMI with SU-MIMO During 2 column vectors of matrix, first column vector can be column vector corresponding with the LI sent in CSI processes #2, second Column vector can be be combined corresponding to CSI processes #2 column vector in the case of the maximum column vector of message capacity.

Base station 20 determines to send prelisting for order 1 using the control information (LI) received from movement station 10 by CSI processes #2 Code matrix.Also, base station 20 determines to send order 2 using the control information (LI) received from movement station 10 by CSI processes #3 Pre-coding matrix.So, base station 20 is not to receive pre-coding matrix in itself, but precoding square can just be determined by only receiving LI Battle array.As a result, the efficient transmitting-receiving of information can be controlled.

As described above, movement station 10 carries out the radio communication based on spatial reuse between base station 20.Move Dynamic station 10 has CSI calculating parts 14 and sends RF portions 19.CSI calculating parts 14 select from multiple data units (Fig. 7 code word 1,2) Channel quality (such as CQI) highest data unit is selected, also, receiving quality is selected in the space layer for belong to the data unit (such as SINR) highest space layer.Send the space layer that CSI calculating parts 14 are selected in RF portions 19 identification information (such as LI) it is sent to base station 20 as control information.

In movement station 10, sending RF portions 19 can also be to the transmission of base station 20 and the space layer recommended in above-mentioned spatial reuse Space encoding information corresponding to number (such as RI, PMI shown in Fig. 5 S3) is as the 1st channel condition information (such as CSI processes # 1).Then, the identification letter of above-mentioned receiving quality (such as SINR) highest space layer can be sent to base station 20 by sending RF portions 19 Breath (such as LI shown in Fig. 5 S4) is used as the 2nd channel condition information (such as CSI process #2).

In movement station 10, it is high that transmission RF portions 19 can also send above-mentioned receiving quality (such as SINR) second to base station 20 Space layer identification information (such as LI shown in Fig. 5 S4) the 3rd channel shape follow-up as above-mentioned 2nd channel condition information State information (such as CSI process #3).

On the other hand, the radio communication based on spatial reuse is carried out between base station 20 and movement station 10.Base station 20, which has, to be connect Receive RF portions 211, precoding determination section 24, precoding processing portion 26a, 26b, 26c.RF portions 211 are received to connect from movement station 10 Receive the identification information (such as LI) of quality (such as SINR) highest space layer.Above-mentioned space layer is from more numbers in movement station 10 According to after selecting channel quality (such as CQI) highest data unit in unit (such as code word 1,2), be subordinated to the data unit Space layer in select.Precoding determination section 24 uses the identification information of the above-mentioned space layer received by receiving RF portions 211 Determine space encoding information (such as pre-coding matrix).Precoding processing portion 26a, 26b, 26c is according to by precoding determination section 24 The space encoding information of decision performs above-mentioned spatial reuse.

Specifically, movement station 10 carries out channel estimation using CSI-RS, obtains and represent movement station when determining above-mentioned LI The matrix H of the channel distortions in mimo channel between 10 and base station 20.Movement station 10 is estimated according to the variance of channel estimation value Count thermal noise and the power of interference.

Then, movement station 10 in the candidate of the sum of ranks pre-coding matrix of whole by sum of ranks precoding that message capacity is maximum Matrix is chosen to be SU-MIMO sum of ranks pre-coding matrix.That is, CSI calculating parts 14 by pre-coding matrix, channel matrix, connect The multiplying of antenna weight matrix is received to estimate the receiving power of each layer, also, with the receiving power divided by thermal noise and is done The power disturbed estimates the reception SINR of each layer.And then CSI calculating parts 14 are averaged to the reception SINR estimated, calculate The reception SINR of each code word, thereby determine that MCS (the Modulation and Coding Scheme of each code word:Modulating-coding side Case).Then, CSI calculating parts 14 estimate message capacity by being added corresponding estimation handling capacity in interlayer.

Then, movement station 10 is according to each code word in the case of the sum of ranks pre-coding matrix for having applied SU-MIMO Reception SINR obtain CQI.Movement station 10 is selected from CQI highest code words receives the high layers of SINR (such as one from upper It is individual or two), by LI to base station 20 report this layer identifier.

Thus, movement station 10 can for the progress of base station 20 channel status reporting, (CSI be anti-using less control information Feedback).As a result, can by the overhead of less control information come realize be suitable for each MIMO method (such as SU-MIMO, MU-MIMO) and each physical channel (such as PDSCH, EPDCCH) closed loop precoding.

(variation)

In the above-described embodiments, movement station 10 is carried out anti-in the high code words of CQI to the LI for receiving the good layers of SINR Feedback.But because CQI is the index that represents the average channel quality in code word, so, there is optimum reception in whole code words SINR layer not necessarily belongs to the high code words of CQI.Therefore, the CSI calculating parts 14 of movement station 10 can also be not limited to CQI height It is low, and layer of the selection with optimum reception SINR from whole code words.

Figure 10 is the figure of the control information for the precoding that variation is shown according to each CSI processes.As shown in Figure 10, exist It is same in CSI processes #1, movement station 10 to base station 20 send SU-MIMO by the use of recommendation order recommendation PMI as prelisting The control information of code.On the other hand, in CSI processes #2, movement station 10 will receive the LI and the layer of the most good layers of SINR The numbering of affiliated code word is sent to base station 20 as the control information of precoding.Thus, the control information in CSI processes #2 Digit reduced from conventional 4 to 3 (=2+1) positions.Equally, in CSI processes #3, it is good that movement station 10 will receive SINR second The numbering of code word belonging to the LI and this layer of good layer is sent to base station 20 as the control information of precoding.Thus, CSI enters The digit of control information in journey #3 is also reduced to 3 (=2+1) positions from conventional 4.

In this approach, the CSI calculating parts 14 of movement station 10 are subordinated to above-mentioned multiple data units (Fig. 7 code word 1,2) Whole space layers in select receiving quality (such as SINR) highest space layer.The transmission RF portions 19 of movement station 10 are by above-mentioned sky The identification of the identification information (such as code word 1) of data unit belonging to interbed and the space layer selected by CSI calculating parts 14 is believed Breath (such as LI) is sent to base station 20 together as control information.That is, in addition to the LI for the layer selected, movement station 10 also to Feed back the numbering (such as Fig. 7 code word 1) of the code word belonging to this layer in base station 20.Therefore, send what is received in CSI processes #2, #3 The digit of control information increases to 3 from 2 (reference pictures 9) of above-described embodiment, but it is possible to carry out higher based on quality The data transmission of layer.

In addition, in above-described embodiment and variation, as the physical channel for applying precoding, exemplified with EPDCCH and PDSCH.But EPDCCH for example can also be PDCCH (Physical Downlink Control CHannel:Physical down Link control channel), PCFICH (Physical Control Format Indicator CHannel:Physical control format refers to Show symbol channel) etc. other control channels.Also, PDSCH can also be other data channels.

Also, in above-described embodiment and variation, the CSI calculating parts 14 of movement station 10 are in the selection of code word, reference CQI value is as the index for representing channel quality.However, it is possible to instead of CQI value, but make CSI calculating parts 14 with reference to expression electric wave RSSI (the Received Signal Strength Indication of intensity:Received signal strength identify) value or represent electric wave SIR (the Signal to Interference Ratio of state:Signal to noise ratio) value, SINR value etc..

In addition, in above-described embodiment and variation, the CSI calculating parts 14 of movement station 10 are in the selection of space layer, ginseng According to SINR value as the index for representing receiving quality.However, it is possible to instead of SINR value, but make CSI calculating parts 14 with reference to sir value Or represent the RSSI value of received-signal strength.

Label declaration

10:Movement station;10a:CPU (central processing unit);10b:Memory;10c:RF (radio frequency) circuit;10d:Display dress Put;11:Receive RF portions;12:FFT (Fast Fourier Transform (FFT)) portion;13:Channel estimation unit;14:CSI (channel condition information) is counted Calculation portion;14a:LI decision tables;14b:LI digit tables;14c、14d:Precoding control information table;15:Control signal demodulation section; 16:Demodulated data signal portion;17:Control signal generating unit;18:IFFT (inverse fast Fourier transform) portion;19:Send RF portions; 20:Base station;20a:DSP (digital signal processor);20b:FPGA (field programmable gate array);20c:Memory;20d:RF Circuit;20e:Network IF (interface) portion;21:Scheduling unit;22:Data-signal generating unit;23:Control signal generating unit;24:Prelist Code determination section;25:UE (user equipment)-specific (special) RS (reference signal) generating unit;26a、26b、26c:Precoding Processing unit;27:CSI-RS generating units;28:Physical channel multiplexing unit;29:IFFT Department;210:Send RF portions;211:Receive RF portions; 212:FFT portions;213:Control signal demodulation section;A1:Movement station antenna;A2、A3:Antenna for base station;d:Each 1~N of layer hair Send symbol;j、k:Layer numbering;M:The antenna number of base station;N:The rank number (number of plies) of spatial reuse;s:The transmission symbol of each antenna;w: Order N pre-coding matrixes.

Claims (6)

1. a kind of movement station, it carries out the radio communication based on spatial reuse between base station, it is characterised in that the movement station has Have:
Selector, it selects channel quality highest data unit from multiple data units, and is belonging to the data unit Space layer in selection receiving quality highest space layer;And
Sending part, the identification information of its space layer for selecting the selector are sent to the base station as control information,
The base station is not to receive pre-coding matrix in itself, but only receives level indicator to determine pre-coding matrix.
2. movement station according to claim 1, it is characterised in that
The selector is subordinated to selection receiving quality highest space layer in the space layer of the multiple data unit,
The space layer that the sending part selects the identification information of the data unit belonging to the space layer and the selector Identification information be sent to the base station together as control information.
3. movement station according to claim 1, it is characterised in that
Space encoding information corresponding with the space number of plies is sent to the base station by the sending part as the 1st channel condition information Afterwards, the identification information of the receiving quality highest space layer is sent to the base station as the 2nd channel condition information.
4. movement station according to claim 3, it is characterised in that
The sending part using the identification information of the 2nd high space layer of receiving quality as the 2nd channel condition information after The 3rd continuous channel condition information is sent to the base station.
5. a kind of base station, it carries out the radio communication based on spatial reuse between movement station, it is characterised in that the base station has Have:
Acceptance division, it receives identification information from the movement station, and the identification information is from multiple data sheets in the movement station After selecting channel quality highest data unit in position, it is subordinated to the receiving quality selected in the space layer of the data unit The identification information of highest space layer;
Determination section, it determines space encoding information using the identification information of the space layer received by the acceptance division;With And
Enforcement division, it performs the spatial reuse according to the space encoding information determined by the determination section,
The base station is not to receive pre-coding matrix in itself, but only receives level indicator to determine pre-coding matrix.
A kind of 6. communication control method, it is characterised in that
The movement station that the radio communication based on spatial reuse is carried out between base station selects channel quality from multiple data units Highest data unit, and receiving quality highest space layer is selected in the space layer for belong to the data unit,
The base station is sent to using the identification information for the space layer selected as control information,
The base station is not to receive pre-coding matrix in itself, but only receives level indicator to determine pre-coding matrix.
CN201380075248.8A 2013-04-04 2013-04-04 Movement station, base station and communication control method CN105075161B (en)

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